frontends/va: remove non-idiomatic mechanism to announce 10bit av1 support
In change [0b02db30], we introduced this mechanism, which declared support for P010 under the YUV420 RT format. But this is abnormal, as clients will generally expect the YUV420_10 RT format to be used for 10bit content. In change [0504a3b0], I implemented the necessary logic to declare YUV420_10 support in the radeonsi driver (which is where the gap really was).
As such, the first change can be reverted.
Signed-off-by: Philip Langdale philipl@overt.org